1.

12 + 1 + 22 + 2 + 32 + 3 + 42 + 4 + …………………… + n2 + n =A) \(\cfrac{n(n+1)(n+2)}3\)B) \(\cfrac{n(n+1)}2\)C) \(\cfrac{n(n+1)(n+2)(n+3)}4\)D) \([\cfrac{n(n+1)}2]^2\)

Answer»

Correct option is A) \(\cfrac{n(n+1)(n+2)}3\)



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